<pre>Parameter queries

You must place the variable between square brackets (=[x]) to create a query with variable parameters.
Alternatively, you can use an equal sign followed by a colon (=:x).
When the query is executed, the program will display a dialog asking you for the expression to which the variable x should be assigned.

If you query several parameters at the same time, you will see a list field in the dialog containing all of the parameters 
and an input line alongside each one. Enter the values, preferably from top to bottom, and press the Enter key after each line.
Parameter queries with placeholders (*, _) or special characters (for example, ?) are not possible.

If you formulate a parameter query and you save it with the variables, you can later create 
a query in which only the variables have to be replaced by the expressions that you want. 
LibreOffice asks for these variables in a dialog as soon as you open the query.</pre>